Please explain how this property call works

using System;

<pre>
namespace ConsoleApp2
{
    class Program
    {


        class A
        {
            int Fa = 1 ;

            public A() { ++Fa; }

            public int f { get { return ++Fa; } set { Fa += value; } }
        }
        class B : A
        {
            static int Fb = 2 ;
            public B() { Fb++; base.f = 2; }
            public new int f { get{ return Fb++ ;}  set { Fb += value ;} }
                public override string ToString() { return String.Format("{0}", base.f + f); }
        }
            static void Main()
            {
            B obj1 = new B(), obj2 = new B(), obj3 = new B();
            obj3.f=obj2.f ;
            Console.Write(obj1);
            Console.Write(obj1);
            Console.Write(obj1);
            }
        
    }
}